Surface working devices



Jan. 15, 195 KNUD-ERIK v. o. c. HASTRUP 2,777,140

SURFACE WORKING DEVICES 2 Sheets-Sheet 1 Filed Dec. 23, 1952 X fig? 28 20 5 /7 24 23 llll K-imafji Jan. 15, 11957 v KNUD-ERIK.V. o. G. HASTRUP 2,777,140

SURFACE WORKING DEVICES 2 Sheets-Sheet 2 Filed Dec. 23, 1952 2,777,140 st Acnwonxm cnn'vrcns Kline-Erik vilhelmolur GnattHa'strup,

Oopenhagen, Denmark A neafionneeeniberzs, isszgsenn No.327,j646 .cl i r riority, application Denmark :February 2,1 a -claims. {cue-:49)

"The present invention relates to 'floor-treating tools. A The term fioor-treating toolsFas used here and in the following specification shall 'be understood to .comprise any floor treating machine having brushes, polishing nrenibers, scrubbing members "orscouringmembers.

The invention aims -to. provide a floor-treating tool of 'a'riyof'the classes here referred to in whichra rotation of :the'tloor 'treating member that engages the surface of-the floo'r is obtained automatically Whenthe tool issu'bjected to "a reciprocating movement.

'A fur'therlpurpose of the invention isto provide a'tool hayin a floor-treating \member capable of. supporting the "tool onthe surface ofthefioor and beingsubjectedto such a' fr iction oifset relative to its center ofrotation that :-said "friction alone will be sufficient to causearotation of the floor-treating member when the tool issubjectedto a-recip- 'rocable movement.

' The main object of the inventionis toprovide a'sur- "face wofkingdevice of the type described which operates without subjecting the device to canting actuations.

A further objectof the=invention is -to;provide a device of the said type which is simple in designand cheap-in manufacture and easy to manipulate.

These and other objects of-the inventionwill be evident 'fromthe following description takeninconjunction with the accompanying drawing, in which- Fig. 1 shows a sectional :viewof one manner --of con- "struction of a surface working apparatusraccording'to:the invention, taken along the line '1-1 .in'F-ig. 3,

Fig. 2is a vertical section-along the =line-2-2 in Fig. 3, and

Fig. 3 is a horizontal section-along the :line 3-3 in 'Fig. 1.

I QInJthe drawing, l indicatesbr-istles:securedin-aiholder 2 so as to form a flatoperative surface. The :holderis retained "in a disc 3 by meansof an-elongatedpivotal "connecting bar member 4 inserted within an elongated aperture or .s1ot5 in the lower surface ofthe 'ho1der2. The turn buckle 4-ispivotally attached centrally to azleaf spring 6 the ends of which are fixed by means ofs'crews 7 and 8 to disc 3. The holder 2 having the slot therein is retained to the disk 3 byfirst:inserting thezpivotal connecting'bar 4 of the holder 2 through the slot 5, rotating member 4 on its'pivota'l conne'c'tiorron-the spring 6 so that it is disposed at right angles to the.sl0t5 in gripping en- ,Tgagenrent'wi'th the undersur face of holder 2=as seen in Figurel.

. iThe center'portion of 'the disc.3 whasa vertically-disp'ds'edtxibtilar'bearing '9for rotatably supporting a shaft 10, the upper endof 'v'v'hieh'b'y :sc'rew threads is secured to a body or a carrier member 12 in a middle,-portion 11 thet'edf having'en'larged 'cross' section. 'This carrier member 12 includes *inthe embodiment"illustrated an elongated middle portion 12a provided with a longitudinal rib 13. Thus the body or carrier member 12 is by means of the bearing 9 supported on the structure comprising the disc 3, the holder 2 and the brushes or bristles 1 in such a manner that mutual relative rotation is allowed United ims Pate t :2 between the body or carrier structure and the disc --strncture.

The body structure comprises besides the middle por- .tion 12a parts extending at either side thereof referred to as 13a and 14a respectively. The portion 13a furtherrhas a projection 13b in which a bearing .17 is formed. The body portionl-4a has adjacent itsiend an-enlarged portion 14 forming a weight member having its-center 0f,;g1'=avity disposed ilaterally offset with frcspect to :the central shaft -.or spindle 10. Inthe member 14 a bore 18 is provided theone end of which at 19 :forms :a bearingin alignment with the bearing 17 so as to receive'a spindle20.

. The body portion '14 furthermore is provided with rpmjectionsor lugs .15" and16 in spaced relationship at either .side of .the center portion 14a.

The lugs l5 and 16 ,land-the end portion 13a of ithecarlrier member 12 have holesfor screws 21, 22 and23 respectively by \means :of which the carrier :member is .at- =ta'ched rto=a=casing 24'having anexteri'or circumferential wall v25 ithat extends down to substantially enclose zthe holder. Thecasing 24 has at one side aslot 2.6 for the passage rot" a :handle shaft portion .28 thatis rigidly "securedtto theispindle=20 to .allow it-to swing vertically and has pe'rpendicular thereto a cut-away portion 27 that provides space for the center portion of the 'spindlelzll. Theother'endrof thezhandle shaft portion 28 is-fixediin a holder '29 .f'orian elongated handle 30 :thatis only .indicared in i'the drawings but'forms an extended :handle :by means of which .the apparatus can 'be:pushed;and1pulled forth andback :over the floorsurfa'ce. The ;p.ortion ,27 is so shaped lthat the'handle 30-and rod .28acan swing up and down by swinging the' spindle 20in its lbearings-1'7' and 19.

The lower edge of thecasing 25 is provided with :an external ahead 31 by means of which arrubberband 32'is hel'd-inpositionalong the exterior edge of the casing.

The'handle member 30 has preferably such-a:.len'gth that the apparatus can be handled by the operator in .an upright position. The weight of the portion 1.4-:is :50 adapted, and the portionso positioned in'relati'onitothe other parts of theapparatus that the center of gravity v:of the entire apparatus is Y laterally. disposed. relatively to ;'the rotational axis of the shaft 10; this displacement is rtapproximately o'nesixth of the diameter'of'the'holder 2.

The mode of operation of the apparatus describedvis substantially as follows:

The apparatus is placed on 'thefloor resting 'on the bristles Or-brushes 1. Hereby thexbodystructure can'as explained here. above rotate relatively to Lthe flooritreating :structure constituted'by the brushesand by swinging'the .handle '30 the entire bo'dytstructure and exterior h'ousing -supported on the bristle structure will rotate :aboutfithe centralaxis of the apparatus,'viz. the spindle 10.

In any;position of "the body structure the weight'm'ember 14 will stillhave'its .center=ofrgravit-y laterally offset, relatively to the mutual axisof rotation and to the plane -forrned bylthe handleasiitaswings with the spindleso as to therebycause an eccentric directed pressure on "the bristle structure with the :result :that pulling or pushing 'themaehine 'by means of the'handle 30't'his eccentrically directed force will automatically cause the-bristle structure-to rotate'when the machine-is reciprocated over=the floor surface, because the eccentrically directed force will cause tha-t part :of "the bristlesurface that lies verticallyz under the weight'imember to engage "the "floorsurface with a: frictiontthat is 'larger than that friction with which the remaining part of the bristle structure engages the floor surface.

It will be understood that the embodiment illustrated shall serve as an example only and that modifications are possible within the scope of the invention. Thus, the invention is not limited to the combination with a brush member, and any other rotating polishing scouring or scrubbing member may be employed. The handle shaft does not need to be arranged to swing up and down though this arrangement is preferred. Further, the casing may be omitted. The displacement of the centre of gravity may be produced in any other appropriate manner than by means of the enlarged portion 14, e. g. the casing 24, 25 may be provided with a thickened portion for the same purpose.

I declare that what I claim is:

1. In an apparatus for treating floor surfaces in combination: a floor treating member arranged for rotatable movement about a vertical axis and having a floor treating surface perpendicular thereto capable of supporting said apparatus on said floor surface, a carrier member supported on said floor treating member and rotatable relatively thereto about said vertical axis, a spindle, a handle member connected to said spindle and extending perpendicularly therefrom, a pair of aligned bearings provided in said carrier member rotatably supporting said spindle in position normal to the vertical axis to allow said handle member to swing vertically when moving said apparatus over the floor surface by pushing and pulling said handle member and a weight member firmly connected with said carrier member with the center of gravity of the weight member being in lateral offset relationship with respect to the vertical axis and a vertical plane extending through the longitudinal axis of the handle memher.

2. In apparatus for treating floor surfaces in combination: a floor treating member arranged for rotatable movement about a vertical axis and having a floor treating surface perpendicular to said axis capable of sup porting said apparatus on said floor surface, a carrier member supported above said floor treating member, bearing means between said floor treating member and said carrier member to allow mutual relative rotation between said :carrier member and said floor treating member, handle means connected with said carrier member laterally offset with respect to said vertical axis to enable said apparatus to effectuate a reciprocable movement by pushing and pulling said handle means in its longitudinal direction and a weight member firmly connected with said carrier member, the weight member having its centre of gravity in offset lateral relationship with respect to the vertical axis and a vertical plane extending through the longitudinal axis of said handle means.

3. in floor treating apparatus in combination: a disc member arranged for free rotatable movement about a vertical axis that substantially coincides with the center a weight member firmly connected with said carrier mcmber, the weight member having its center of gravity laterally olfset relatively to said vertical axis and a handle member operatively connected with said carrier member extending in such radial relationship relatively to said vertical axis that the center of gravity of said Weight mem' beer is offset from a vertical plane passing through the longitudinal axis of the handle member so that reciprocablemovement of said apparatus in the longitudinal direction of said handle member will cause a laterally offset load on said floor treating surface sufiicient to cause rotating thereof in response to said reciprocable movement.

4. In floor treating apparatus the combination comprising a floor treating member, a holder for said floor treating member and capable of supporting said apparatus with said floor treating member engaging a floor portion, a casing member overlying said holder, said holder being freely rotatably supported about a vertical axis of rotation in said casing, an upwardly extending handle portion on said casing in radial offset relationship relative to the vertical axis of rotation of the holder, the longitudinal axis of said handle portion being maintained in a single vertical plane intersecting the vertical axis of rotation of said holder, and a weight member supported in a fixed offset lateral relationship from the vertical plane formed by the intersection of the longitudinal axis of the handle portion and the axis of rotation of said holder for maintaining the center of gravity of the floor treating apparatus in an offset relationship from the axis of rotation of the holder for increasing the relative frica relative rotation between said carrier member and said treating member about said vertical axis, a handle portion, a connection between said handle portion and said carrier member stiff in tangential direction relatively to said vertical axis to enable said treating member to effectuate a reciprocable movement by pushing and pulling said handle portion, and a weight member firmly connected with said carrier member with the center of gravity of the weight member beingin offset lateral relationship with respect to the vertical axis and a vertical plane extendingthrough the longitudinal axis of the handle portion. I

6. In a floor treating apparatus in combination: a floor treating member, a holder for said floor treating member being freely rotatable about a substantially vertical axis when said apparatus is supported on a floor with said floor treating member in engagement with the floor surface, a carrier member overlying said holder, means connecting said holder and said carrier member to allow a mutual rotation thereof, a handle portion, means connecting said handle portion with said carrier member to prevent relative rotation between the handle portion and the carrier member by pulling and pushing said handle portion, and a weight member connected to said carrier member, the weight member having its center of gravity laterally offset relative to the direction of the reciprocable movement of said carrier member caused by pulling and pushing said handle portion to subject said floor treating member to an increased lateral pressure relatively to its axis of rotation whereby said floor treating member will rotate automatically when said carrier member is reciprocated.

(Addition to No. 666,274) 

